Method and apparatus for controlling a small spacing between a m

Details Method and apparatus for controlling a small spacing between a m Method and apparatus for controlling a small spacing between a m

1993-07-08

1995-02-21

Callahan, Timothy P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, 360109, 360110, G11B 2102, G11B 5596, G11B 556, G11B 5127

Patent

active

053921739

ABSTRACT:
The spacing between a magnetic disk surface and a magnetic head tends to greatly decrease with an increasing request for higher density records. Measuring and controlling the small spacing is important for stabilized recording or reading. A substrate is attached to a side of a support which supports the magnetic head. Light is irradiated onto a surface of the substrate and totally reflected thereby. The small spacing is measured by measuring the quantity of the totally reflected light. An actuator is controlled such that the measured small spacing is maintained at a target value to thereby realize constant small-spacing control.

REFERENCES:
patent: 4146911 (1979-03-01), Gyi et al.
patent: 4570191 (1986-02-01), DiStefano et al.
patent: 4593368 (1986-06-01), Fridge et al.
patent: 4931887 (1990-06-01), Hedge et al.

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